Every design is a seamless repeat tile: the edges wrap, so copies join with no gaps. Use Tile Preview 3×3 to check. The SVG contains only filled shapes (no strokes). Amount = tiles across. Variation = randomness. Detail = holes (stars, quatrefoil), block types (quilt), stitch rounding (Fair Isle), chip density (terrazzo).
SVG is exported as filled outlines (no strokes), black background, white shapes.